Effects of carrier-attached biofilm on oxygen transfer efficiency in a moving bed biofilm reactor

Yanling WEI, Xunfei YIN, Lu QI, Hongchen WANG, Yiwei GONG, Yaqian LUO

Front. Environ. Sci. Eng. ›› 2016, Vol. 10 ›› Issue (3) : 569-577.

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Front. Environ. Sci. Eng. ›› 2016, Vol. 10 ›› Issue (3) : 569-577. DOI: 10.1007/s11783-015-0822-x
RESEARCH ARTICLE
RESEARCH ARTICLE

Effects of carrier-attached biofilm on oxygen transfer efficiency in a moving bed biofilm reactor

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Abstract

Three laboratory-scale moving bed biofilm reactors (MBBR) with different carrier filling ratios ranging from 40% to 60% were used to study the effects of carrier-attached biofilm on oxygen transfer efficiency. In this study, we evaluated the performance of three MBBRs in degrading chemical oxygen demand and ammonia. The three reactors removed more than 95% of NH4+-N at an air flow-rate of 60 L·h-1. The standard oxygen transfer efficiency (αSOTE) of the three reactors was also investigated at air flow-rates ranging from 60 to 100 L·h-1. These results were compared to αSOTE of wastewater with a clean carrier (no biofilm attached). Results showed that under these process conditions, αSOTE decreased by approximately 70% as compared to αSOTE of wastewater at a different carrier-filling ratio. This indicated that the biofilm attached to the carrier had a negative effect on αSOTE. Mechanism analysis showed that the main inhibiting effects were related to biofilm flocculants and soluble microbial product (SMP). Biofilm flocs could decrease αSOTE by about 20%, and SMP could decrease αSOTE by 30%–50%.

Keywords

carrier / biofilm / oxygen transfer efficiency / moving bed biofilm reactor

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Yanling WEI, Xunfei YIN, Lu QI, Hongchen WANG, Yiwei GONG, Yaqian LUO. Effects of carrier-attached biofilm on oxygen transfer efficiency in a moving bed biofilm reactor. Front. Environ. Sci. Eng., 2016, 10(3): 569‒577 https://doi.org/10.1007/s11783-015-0822-x
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Acknowledgements

This study was supported by the National Natural Science Foundation of China (Grant No. 51408601).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
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